This document provides an overview of sets and set operations including union, intersection, and complement. It defines union as arranging all elements in ascending order, intersection as taking common elements, and complement as subtracting a set from the universal set. An example problem is given to find the union, intersection, and complements of sets A={1,2,3,4,5} and B={3,4,5,6,7} where the universal set is U={1,2,3,4,5,6,7}. Homework is assigned for class VII on this topic of sets.

1. ONLINE CLASS OF MATHEMATICS FOR
VII CLASS
TEACHER : SIR AHSAN
TOPIC : SET

2. APPLICATION OF SET
UNION:
Arrange all the elements in ascending
order. Symbol of union is (U).
INTERSECTION:
To take common. Symbol of
intersection is (⋂).
COMPLIMENT:
Subtract any set from universal set. The
recognition of compliment is ( ‘ ).

3. Q1 : If U = {1, 2, 3, 4, 5, 6, 7}
A = {1, 2, 3, 4, 5}
&
B = {3, 4, 5, 6, 7}
Find 1. AUB 2. BUA 3. A’ 4. B’
5. A⋂B 6. B⋂A

4. 1. AUB
Solution:
AUB = {1, 2, 3, 4, 5} U {3, 4, 5, 6, 7}
AUB = {1, 2, 3, 4, 5, 6, 7}

5. 3. A’
Solution:
A’ = U – A = {1, 2, 3, 4, 5, 6, 7} – {1, 2, 3, 4, 5}
A’ = {6, 7}

6. 5. A⋂B
Solution:
A⋂B = {1, 2, 3, 4, 5} ⋂ {3, 4, 5, 6, 7}
A⋂B = {3, 4, 5,}

7. HOME WORK FOR CLASS VII